Cs4PbBr6@PDMS film prepared by a facile two-step method for wide color gamut backlit display.

[Display omitted] • The PLQY of CsPbBr 3 /Cs 4 PbBr 6 @PDMS achieve to 71%. • CsPbBr 3 /Cs 4 PbBr 6 @PDMS composite was studied for the first time and exhibit excellent optical properties. • The stabilit ies of CsPbBr 3 against heat, water and UV light have been greatly improved. • Under the excitation of blue chip, the color coordinate is extremely close to the standard of white light color coordinate. • The as-prepared film with the color gamut that could reach to 127% of NTSC 1953 and 95% of Rec. 2020 and applied in LCD successfully. All-inorganic perovskites have been considered next-generation color converters in the backlit due to their shining optical properties. However, structural instability severely limits their pragmatic applications. Here, CsPbBr 3 /Cs 4 PbBr 6 microcrystals (MCs) were successfully embedded in polydimethylsiloxane (PDMS) films by a facile two-step method. As-prepared PDMS films containing CsPbBr 3 /Cs 4 PbBr 6 MCs (CsPbBr 3 /Cs 4 PbBr 6 @PDMS) obtain high brightness and excellent stability. Meaningfully, the PDMS films not only serve as a double protective matrix that can be used to improve the stability of CsPbBr 3 /Cs 4 PbBr 6 MCs, but also a flexible substrate with high transparency that allows the CsPbBr 3 /Cs 4 PbBr 6 @PDMS films to be used as color conversion materials for backlit displays. To our surprise, when PDMS is coated with CsPbBr 3 /Cs 4 PbBr 6 MCs, the water, thermal and photostability are greatly improved, while the photoluminescence intensity only lost by 10%. Furthermore, by mixing CsPbBr 3 /Cs 4 PbBr 6 MCs with K 2 SiF 6 :Mn4+ phosphors in PDMS, a monolithic film with high performance was obtained. Its color gamut can reach 127% of the NTSC 1953 standard and 95% of the REC. 2020 standard, exhibiting the bright prospects in the backlit display field. [ABSTRACT FROM AUTHOR]